@article{01570663, title = {A characterization of M\"obius transformations.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {23}, year = {2000}, pages = {663-666}, doi = {10.1155/S0161171200010255}, zbl = {0973.30011}, language = {en}, url = {http://dml.mathdoc.fr/item/01570663} }
Niamsup, Piyapong. A characterization of Möbius transformations.. International Journal of Mathematics and Mathematical Sciences, Tome 23 (2000) pp. 663-666. doi : 10.1155/S0161171200010255. http://gdmltest.u-ga.fr/item/01570663/